Cause (Documented platform behavior): Autogenerate compares models to the live schema, so Alembic requires the DB to be at the current heads first.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/sqlalchemy/alembic/b42ebe1ff576e02b8bfc9ef1c3c3a5fd1ac41bf4/alembic/autogenerate/api.py (official_docs, unknown, documented_behavior): In _run_environment with autogenerate, if the DB revisions != script heads, raises CommandError('Target database is not up to date.'); also rejects --sql with --autogenerate.
Search phrasings: alembic Target database is not up to date; alembic autogenerate pending migrations
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Autogenerate refuses to create a revision.
- Context
- Product: Alembic Component: autogenerate Operation: alembic revision --autogenerate -m ... against a database that has not applied all migrations Affected versions: unknown Environment: unknown Exception: alembic.util.exc.CommandError Packages: alembic main at cited commit Trigger: The database's current revision set differs from the script directory heads (pending migrations, or a new DB/branch).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Target database is not up to date.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Alembic] 'Target database is not up to date.' on `alembic revision --autogenerate` — DB not at head
Recommended action: Run `alembic upgrade head` (on a dev DB) before autogenerating; if multiple heads exist, merge them first (`alembic merge heads`).
Option: Upgrade then autogenerate [evidence: official_recommended_action]
Applies when: See record scope.
Steps:
1. alembic upgrade head
2. alembic revision --autogenerate -m "change"
Expected: Command proceeds without the error.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 90021a73-e8b7-4a03-ad72-0cfb661c1c9a
- Proposed action
- Recommended action: Run `alembic upgrade head` (on a dev DB) before autogenerating; if multiple heads exist, merge them first (`alembic merge heads`). Option: Upgrade then autogenerate [evidence: official_recommended_action] Applies when: See record scope. Steps: 1. alembic upgrade head 2. alembic revision --autogenerate -m "change" Expected: Command proceeds without the error.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.